Westerplatte (German) comes from German platte, from Middle High German platte, from Old High German platta, from Vulgar Latin platta, from Latin plattus, from Ancient Greek πλατύς, from Proto-Indo-European pléth₂us, from Proto-Indo-European pleth₂- — flat.
Ancestry of “Westerplatte”, step by step
Westerplatte traces back through two separate lines of ancestry.